| 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2008 Ralf Baechle (ralf@linux-mips.org) |
| 7 | * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. |
| 8 | */ |
| 9 | #include <linux/bitmap.h> |
| 10 | #include <linux/clocksource.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/irq.h> |
| 14 | #include <linux/irqchip.h> |
| 15 | #include <linux/irqchip/mips-gic.h> |
| 16 | #include <linux/of_address.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/smp.h> |
| 19 | |
| 20 | #include <asm/mips-cm.h> |
| 21 | #include <asm/setup.h> |
| 22 | #include <asm/traps.h> |
| 23 | |
| 24 | #include <dt-bindings/interrupt-controller/mips-gic.h> |
| 25 | |
| 26 | unsigned int gic_present; |
| 27 | |
| 28 | struct gic_pcpu_mask { |
| 29 | DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS); |
| 30 | }; |
| 31 | |
| 32 | static void __iomem *gic_base; |
| 33 | static struct gic_pcpu_mask pcpu_masks[NR_CPUS]; |
| 34 | static DEFINE_SPINLOCK(gic_lock); |
| 35 | static struct irq_domain *gic_irq_domain; |
| 36 | static int gic_shared_intrs; |
| 37 | static int gic_vpes; |
| 38 | static unsigned int gic_cpu_pin; |
| 39 | static unsigned int timer_cpu_pin; |
| 40 | static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; |
| 41 | |
| 42 | static void __gic_irq_dispatch(void); |
| 43 | |
| 44 | static inline unsigned int gic_read(unsigned int reg) |
| 45 | { |
| 46 | return __raw_readl(gic_base + reg); |
| 47 | } |
| 48 | |
| 49 | static inline void gic_write(unsigned int reg, unsigned int val) |
| 50 | { |
| 51 | __raw_writel(val, gic_base + reg); |
| 52 | } |
| 53 | |
| 54 | static inline void gic_update_bits(unsigned int reg, unsigned int mask, |
| 55 | unsigned int val) |
| 56 | { |
| 57 | unsigned int regval; |
| 58 | |
| 59 | regval = gic_read(reg); |
| 60 | regval &= ~mask; |
| 61 | regval |= val; |
| 62 | gic_write(reg, regval); |
| 63 | } |
| 64 | |
| 65 | static inline void gic_reset_mask(unsigned int intr) |
| 66 | { |
| 67 | gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr), |
| 68 | 1 << GIC_INTR_BIT(intr)); |
| 69 | } |
| 70 | |
| 71 | static inline void gic_set_mask(unsigned int intr) |
| 72 | { |
| 73 | gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr), |
| 74 | 1 << GIC_INTR_BIT(intr)); |
| 75 | } |
| 76 | |
| 77 | static inline void gic_set_polarity(unsigned int intr, unsigned int pol) |
| 78 | { |
| 79 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) + |
| 80 | GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr), |
| 81 | pol << GIC_INTR_BIT(intr)); |
| 82 | } |
| 83 | |
| 84 | static inline void gic_set_trigger(unsigned int intr, unsigned int trig) |
| 85 | { |
| 86 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) + |
| 87 | GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr), |
| 88 | trig << GIC_INTR_BIT(intr)); |
| 89 | } |
| 90 | |
| 91 | static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual) |
| 92 | { |
| 93 | gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr), |
| 94 | 1 << GIC_INTR_BIT(intr), |
| 95 | dual << GIC_INTR_BIT(intr)); |
| 96 | } |
| 97 | |
| 98 | static inline void gic_map_to_pin(unsigned int intr, unsigned int pin) |
| 99 | { |
| 100 | gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) + |
| 101 | GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin); |
| 102 | } |
| 103 | |
| 104 | static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe) |
| 105 | { |
| 106 | gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) + |
| 107 | GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe), |
| 108 | GIC_SH_MAP_TO_VPE_REG_BIT(vpe)); |
| 109 | } |
| 110 | |
| 111 | #ifdef CONFIG_CLKSRC_MIPS_GIC |
| 112 | cycle_t gic_read_count(void) |
| 113 | { |
| 114 | unsigned int hi, hi2, lo; |
| 115 | |
| 116 | do { |
| 117 | hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); |
| 118 | lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00)); |
| 119 | hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32)); |
| 120 | } while (hi2 != hi); |
| 121 | |
| 122 | return (((cycle_t) hi) << 32) + lo; |
| 123 | } |
| 124 | |
| 125 | unsigned int gic_get_count_width(void) |
| 126 | { |
| 127 | unsigned int bits, config; |
| 128 | |
| 129 | config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
| 130 | bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >> |
| 131 | GIC_SH_CONFIG_COUNTBITS_SHF); |
| 132 | |
| 133 | return bits; |
| 134 | } |
| 135 | |
| 136 | void gic_write_compare(cycle_t cnt) |
| 137 | { |
| 138 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI), |
| 139 | (int)(cnt >> 32)); |
| 140 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO), |
| 141 | (int)(cnt & 0xffffffff)); |
| 142 | } |
| 143 | |
| 144 | void gic_write_cpu_compare(cycle_t cnt, int cpu) |
| 145 | { |
| 146 | unsigned long flags; |
| 147 | |
| 148 | local_irq_save(flags); |
| 149 | |
| 150 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu); |
| 151 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI), |
| 152 | (int)(cnt >> 32)); |
| 153 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO), |
| 154 | (int)(cnt & 0xffffffff)); |
| 155 | |
| 156 | local_irq_restore(flags); |
| 157 | } |
| 158 | |
| 159 | cycle_t gic_read_compare(void) |
| 160 | { |
| 161 | unsigned int hi, lo; |
| 162 | |
| 163 | hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI)); |
| 164 | lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO)); |
| 165 | |
| 166 | return (((cycle_t) hi) << 32) + lo; |
| 167 | } |
| 168 | |
| 169 | void gic_start_count(void) |
| 170 | { |
| 171 | u32 gicconfig; |
| 172 | |
| 173 | /* Start the counter */ |
| 174 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
| 175 | gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF); |
| 176 | gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); |
| 177 | } |
| 178 | |
| 179 | void gic_stop_count(void) |
| 180 | { |
| 181 | u32 gicconfig; |
| 182 | |
| 183 | /* Stop the counter */ |
| 184 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
| 185 | gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF; |
| 186 | gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig); |
| 187 | } |
| 188 | |
| 189 | #endif |
| 190 | |
| 191 | static bool gic_local_irq_is_routable(int intr) |
| 192 | { |
| 193 | u32 vpe_ctl; |
| 194 | |
| 195 | /* All local interrupts are routable in EIC mode. */ |
| 196 | if (cpu_has_veic) |
| 197 | return true; |
| 198 | |
| 199 | vpe_ctl = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL)); |
| 200 | switch (intr) { |
| 201 | case GIC_LOCAL_INT_TIMER: |
| 202 | return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK; |
| 203 | case GIC_LOCAL_INT_PERFCTR: |
| 204 | return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK; |
| 205 | case GIC_LOCAL_INT_FDC: |
| 206 | return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK; |
| 207 | case GIC_LOCAL_INT_SWINT0: |
| 208 | case GIC_LOCAL_INT_SWINT1: |
| 209 | return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK; |
| 210 | default: |
| 211 | return true; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static void gic_bind_eic_interrupt(int irq, int set) |
| 216 | { |
| 217 | /* Convert irq vector # to hw int # */ |
| 218 | irq -= GIC_PIN_TO_VEC_OFFSET; |
| 219 | |
| 220 | /* Set irq to use shadow set */ |
| 221 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) + |
| 222 | GIC_VPE_EIC_SS(irq), set); |
| 223 | } |
| 224 | |
| 225 | void gic_send_ipi(unsigned int intr) |
| 226 | { |
| 227 | gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr)); |
| 228 | } |
| 229 | |
| 230 | int gic_get_c0_compare_int(void) |
| 231 | { |
| 232 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) |
| 233 | return MIPS_CPU_IRQ_BASE + cp0_compare_irq; |
| 234 | return irq_create_mapping(gic_irq_domain, |
| 235 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER)); |
| 236 | } |
| 237 | |
| 238 | int gic_get_c0_perfcount_int(void) |
| 239 | { |
| 240 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) { |
| 241 | /* Is the performance counter shared with the timer? */ |
| 242 | if (cp0_perfcount_irq < 0) |
| 243 | return -1; |
| 244 | return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq; |
| 245 | } |
| 246 | return irq_create_mapping(gic_irq_domain, |
| 247 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR)); |
| 248 | } |
| 249 | |
| 250 | int gic_get_c0_fdc_int(void) |
| 251 | { |
| 252 | if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) { |
| 253 | /* Is the FDC IRQ even present? */ |
| 254 | if (cp0_fdc_irq < 0) |
| 255 | return -1; |
| 256 | return MIPS_CPU_IRQ_BASE + cp0_fdc_irq; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Some cores claim the FDC is routable but it doesn't actually seem to |
| 261 | * be connected. |
| 262 | */ |
| 263 | switch (current_cpu_type()) { |
| 264 | case CPU_INTERAPTIV: |
| 265 | case CPU_PROAPTIV: |
| 266 | return -1; |
| 267 | } |
| 268 | |
| 269 | return irq_create_mapping(gic_irq_domain, |
| 270 | GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC)); |
| 271 | } |
| 272 | |
| 273 | static void gic_handle_shared_int(bool chained) |
| 274 | { |
| 275 | unsigned int i, intr, virq; |
| 276 | unsigned long *pcpu_mask; |
| 277 | unsigned long pending_reg, intrmask_reg; |
| 278 | DECLARE_BITMAP(pending, GIC_MAX_INTRS); |
| 279 | DECLARE_BITMAP(intrmask, GIC_MAX_INTRS); |
| 280 | |
| 281 | /* Get per-cpu bitmaps */ |
| 282 | pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask; |
| 283 | |
| 284 | pending_reg = GIC_REG(SHARED, GIC_SH_PEND); |
| 285 | intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK); |
| 286 | |
| 287 | for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) { |
| 288 | pending[i] = gic_read(pending_reg); |
| 289 | intrmask[i] = gic_read(intrmask_reg); |
| 290 | pending_reg += 0x4; |
| 291 | intrmask_reg += 0x4; |
| 292 | } |
| 293 | |
| 294 | bitmap_and(pending, pending, intrmask, gic_shared_intrs); |
| 295 | bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs); |
| 296 | |
| 297 | intr = find_first_bit(pending, gic_shared_intrs); |
| 298 | while (intr != gic_shared_intrs) { |
| 299 | virq = irq_linear_revmap(gic_irq_domain, |
| 300 | GIC_SHARED_TO_HWIRQ(intr)); |
| 301 | if (chained) |
| 302 | generic_handle_irq(virq); |
| 303 | else |
| 304 | do_IRQ(virq); |
| 305 | |
| 306 | /* go to next pending bit */ |
| 307 | bitmap_clear(pending, intr, 1); |
| 308 | intr = find_first_bit(pending, gic_shared_intrs); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | static void gic_mask_irq(struct irq_data *d) |
| 313 | { |
| 314 | gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); |
| 315 | } |
| 316 | |
| 317 | static void gic_unmask_irq(struct irq_data *d) |
| 318 | { |
| 319 | gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq)); |
| 320 | } |
| 321 | |
| 322 | static void gic_ack_irq(struct irq_data *d) |
| 323 | { |
| 324 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
| 325 | |
| 326 | gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(irq)); |
| 327 | } |
| 328 | |
| 329 | static int gic_set_type(struct irq_data *d, unsigned int type) |
| 330 | { |
| 331 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
| 332 | unsigned long flags; |
| 333 | bool is_edge; |
| 334 | |
| 335 | spin_lock_irqsave(&gic_lock, flags); |
| 336 | switch (type & IRQ_TYPE_SENSE_MASK) { |
| 337 | case IRQ_TYPE_EDGE_FALLING: |
| 338 | gic_set_polarity(irq, GIC_POL_NEG); |
| 339 | gic_set_trigger(irq, GIC_TRIG_EDGE); |
| 340 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); |
| 341 | is_edge = true; |
| 342 | break; |
| 343 | case IRQ_TYPE_EDGE_RISING: |
| 344 | gic_set_polarity(irq, GIC_POL_POS); |
| 345 | gic_set_trigger(irq, GIC_TRIG_EDGE); |
| 346 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); |
| 347 | is_edge = true; |
| 348 | break; |
| 349 | case IRQ_TYPE_EDGE_BOTH: |
| 350 | /* polarity is irrelevant in this case */ |
| 351 | gic_set_trigger(irq, GIC_TRIG_EDGE); |
| 352 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE); |
| 353 | is_edge = true; |
| 354 | break; |
| 355 | case IRQ_TYPE_LEVEL_LOW: |
| 356 | gic_set_polarity(irq, GIC_POL_NEG); |
| 357 | gic_set_trigger(irq, GIC_TRIG_LEVEL); |
| 358 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); |
| 359 | is_edge = false; |
| 360 | break; |
| 361 | case IRQ_TYPE_LEVEL_HIGH: |
| 362 | default: |
| 363 | gic_set_polarity(irq, GIC_POL_POS); |
| 364 | gic_set_trigger(irq, GIC_TRIG_LEVEL); |
| 365 | gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE); |
| 366 | is_edge = false; |
| 367 | break; |
| 368 | } |
| 369 | |
| 370 | if (is_edge) { |
| 371 | __irq_set_chip_handler_name_locked(d->irq, |
| 372 | &gic_edge_irq_controller, |
| 373 | handle_edge_irq, NULL); |
| 374 | } else { |
| 375 | __irq_set_chip_handler_name_locked(d->irq, |
| 376 | &gic_level_irq_controller, |
| 377 | handle_level_irq, NULL); |
| 378 | } |
| 379 | spin_unlock_irqrestore(&gic_lock, flags); |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | #ifdef CONFIG_SMP |
| 385 | static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, |
| 386 | bool force) |
| 387 | { |
| 388 | unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); |
| 389 | cpumask_t tmp = CPU_MASK_NONE; |
| 390 | unsigned long flags; |
| 391 | int i; |
| 392 | |
| 393 | cpumask_and(&tmp, cpumask, cpu_online_mask); |
| 394 | if (cpumask_empty(&tmp)) |
| 395 | return -EINVAL; |
| 396 | |
| 397 | /* Assumption : cpumask refers to a single CPU */ |
| 398 | spin_lock_irqsave(&gic_lock, flags); |
| 399 | |
| 400 | /* Re-route this IRQ */ |
| 401 | gic_map_to_vpe(irq, cpumask_first(&tmp)); |
| 402 | |
| 403 | /* Update the pcpu_masks */ |
| 404 | for (i = 0; i < NR_CPUS; i++) |
| 405 | clear_bit(irq, pcpu_masks[i].pcpu_mask); |
| 406 | set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask); |
| 407 | |
| 408 | cpumask_copy(d->affinity, cpumask); |
| 409 | spin_unlock_irqrestore(&gic_lock, flags); |
| 410 | |
| 411 | return IRQ_SET_MASK_OK_NOCOPY; |
| 412 | } |
| 413 | #endif |
| 414 | |
| 415 | static struct irq_chip gic_level_irq_controller = { |
| 416 | .name = "MIPS GIC", |
| 417 | .irq_mask = gic_mask_irq, |
| 418 | .irq_unmask = gic_unmask_irq, |
| 419 | .irq_set_type = gic_set_type, |
| 420 | #ifdef CONFIG_SMP |
| 421 | .irq_set_affinity = gic_set_affinity, |
| 422 | #endif |
| 423 | }; |
| 424 | |
| 425 | static struct irq_chip gic_edge_irq_controller = { |
| 426 | .name = "MIPS GIC", |
| 427 | .irq_ack = gic_ack_irq, |
| 428 | .irq_mask = gic_mask_irq, |
| 429 | .irq_unmask = gic_unmask_irq, |
| 430 | .irq_set_type = gic_set_type, |
| 431 | #ifdef CONFIG_SMP |
| 432 | .irq_set_affinity = gic_set_affinity, |
| 433 | #endif |
| 434 | }; |
| 435 | |
| 436 | static void gic_handle_local_int(bool chained) |
| 437 | { |
| 438 | unsigned long pending, masked; |
| 439 | unsigned int intr, virq; |
| 440 | |
| 441 | pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND)); |
| 442 | masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK)); |
| 443 | |
| 444 | bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS); |
| 445 | |
| 446 | intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); |
| 447 | while (intr != GIC_NUM_LOCAL_INTRS) { |
| 448 | virq = irq_linear_revmap(gic_irq_domain, |
| 449 | GIC_LOCAL_TO_HWIRQ(intr)); |
| 450 | if (chained) |
| 451 | generic_handle_irq(virq); |
| 452 | else |
| 453 | do_IRQ(virq); |
| 454 | |
| 455 | /* go to next pending bit */ |
| 456 | bitmap_clear(&pending, intr, 1); |
| 457 | intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | static void gic_mask_local_irq(struct irq_data *d) |
| 462 | { |
| 463 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); |
| 464 | |
| 465 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr); |
| 466 | } |
| 467 | |
| 468 | static void gic_unmask_local_irq(struct irq_data *d) |
| 469 | { |
| 470 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); |
| 471 | |
| 472 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << intr); |
| 473 | } |
| 474 | |
| 475 | static struct irq_chip gic_local_irq_controller = { |
| 476 | .name = "MIPS GIC Local", |
| 477 | .irq_mask = gic_mask_local_irq, |
| 478 | .irq_unmask = gic_unmask_local_irq, |
| 479 | }; |
| 480 | |
| 481 | static void gic_mask_local_irq_all_vpes(struct irq_data *d) |
| 482 | { |
| 483 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); |
| 484 | int i; |
| 485 | unsigned long flags; |
| 486 | |
| 487 | spin_lock_irqsave(&gic_lock, flags); |
| 488 | for (i = 0; i < gic_vpes; i++) { |
| 489 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
| 490 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << intr); |
| 491 | } |
| 492 | spin_unlock_irqrestore(&gic_lock, flags); |
| 493 | } |
| 494 | |
| 495 | static void gic_unmask_local_irq_all_vpes(struct irq_data *d) |
| 496 | { |
| 497 | int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); |
| 498 | int i; |
| 499 | unsigned long flags; |
| 500 | |
| 501 | spin_lock_irqsave(&gic_lock, flags); |
| 502 | for (i = 0; i < gic_vpes; i++) { |
| 503 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
| 504 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << intr); |
| 505 | } |
| 506 | spin_unlock_irqrestore(&gic_lock, flags); |
| 507 | } |
| 508 | |
| 509 | static struct irq_chip gic_all_vpes_local_irq_controller = { |
| 510 | .name = "MIPS GIC Local", |
| 511 | .irq_mask = gic_mask_local_irq_all_vpes, |
| 512 | .irq_unmask = gic_unmask_local_irq_all_vpes, |
| 513 | }; |
| 514 | |
| 515 | static void __gic_irq_dispatch(void) |
| 516 | { |
| 517 | gic_handle_local_int(false); |
| 518 | gic_handle_shared_int(false); |
| 519 | } |
| 520 | |
| 521 | static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc) |
| 522 | { |
| 523 | gic_handle_local_int(true); |
| 524 | gic_handle_shared_int(true); |
| 525 | } |
| 526 | |
| 527 | #ifdef CONFIG_MIPS_GIC_IPI |
| 528 | static int gic_resched_int_base; |
| 529 | static int gic_call_int_base; |
| 530 | |
| 531 | unsigned int plat_ipi_resched_int_xlate(unsigned int cpu) |
| 532 | { |
| 533 | return gic_resched_int_base + cpu; |
| 534 | } |
| 535 | |
| 536 | unsigned int plat_ipi_call_int_xlate(unsigned int cpu) |
| 537 | { |
| 538 | return gic_call_int_base + cpu; |
| 539 | } |
| 540 | |
| 541 | static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id) |
| 542 | { |
| 543 | scheduler_ipi(); |
| 544 | |
| 545 | return IRQ_HANDLED; |
| 546 | } |
| 547 | |
| 548 | static irqreturn_t ipi_call_interrupt(int irq, void *dev_id) |
| 549 | { |
| 550 | smp_call_function_interrupt(); |
| 551 | |
| 552 | return IRQ_HANDLED; |
| 553 | } |
| 554 | |
| 555 | static struct irqaction irq_resched = { |
| 556 | .handler = ipi_resched_interrupt, |
| 557 | .flags = IRQF_PERCPU, |
| 558 | .name = "IPI resched" |
| 559 | }; |
| 560 | |
| 561 | static struct irqaction irq_call = { |
| 562 | .handler = ipi_call_interrupt, |
| 563 | .flags = IRQF_PERCPU, |
| 564 | .name = "IPI call" |
| 565 | }; |
| 566 | |
| 567 | static __init void gic_ipi_init_one(unsigned int intr, int cpu, |
| 568 | struct irqaction *action) |
| 569 | { |
| 570 | int virq = irq_create_mapping(gic_irq_domain, |
| 571 | GIC_SHARED_TO_HWIRQ(intr)); |
| 572 | int i; |
| 573 | |
| 574 | gic_map_to_vpe(intr, cpu); |
| 575 | for (i = 0; i < NR_CPUS; i++) |
| 576 | clear_bit(intr, pcpu_masks[i].pcpu_mask); |
| 577 | set_bit(intr, pcpu_masks[cpu].pcpu_mask); |
| 578 | |
| 579 | irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING); |
| 580 | |
| 581 | irq_set_handler(virq, handle_percpu_irq); |
| 582 | setup_irq(virq, action); |
| 583 | } |
| 584 | |
| 585 | static __init void gic_ipi_init(void) |
| 586 | { |
| 587 | int i; |
| 588 | |
| 589 | /* Use last 2 * NR_CPUS interrupts as IPIs */ |
| 590 | gic_resched_int_base = gic_shared_intrs - nr_cpu_ids; |
| 591 | gic_call_int_base = gic_resched_int_base - nr_cpu_ids; |
| 592 | |
| 593 | for (i = 0; i < nr_cpu_ids; i++) { |
| 594 | gic_ipi_init_one(gic_call_int_base + i, i, &irq_call); |
| 595 | gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched); |
| 596 | } |
| 597 | } |
| 598 | #else |
| 599 | static inline void gic_ipi_init(void) |
| 600 | { |
| 601 | } |
| 602 | #endif |
| 603 | |
| 604 | static void __init gic_basic_init(void) |
| 605 | { |
| 606 | unsigned int i; |
| 607 | |
| 608 | board_bind_eic_interrupt = &gic_bind_eic_interrupt; |
| 609 | |
| 610 | /* Setup defaults */ |
| 611 | for (i = 0; i < gic_shared_intrs; i++) { |
| 612 | gic_set_polarity(i, GIC_POL_POS); |
| 613 | gic_set_trigger(i, GIC_TRIG_LEVEL); |
| 614 | gic_reset_mask(i); |
| 615 | } |
| 616 | |
| 617 | for (i = 0; i < gic_vpes; i++) { |
| 618 | unsigned int j; |
| 619 | |
| 620 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
| 621 | for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) { |
| 622 | if (!gic_local_irq_is_routable(j)) |
| 623 | continue; |
| 624 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << j); |
| 625 | } |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, |
| 630 | irq_hw_number_t hw) |
| 631 | { |
| 632 | int intr = GIC_HWIRQ_TO_LOCAL(hw); |
| 633 | int ret = 0; |
| 634 | int i; |
| 635 | unsigned long flags; |
| 636 | |
| 637 | if (!gic_local_irq_is_routable(intr)) |
| 638 | return -EPERM; |
| 639 | |
| 640 | /* |
| 641 | * HACK: These are all really percpu interrupts, but the rest |
| 642 | * of the MIPS kernel code does not use the percpu IRQ API for |
| 643 | * the CP0 timer and performance counter interrupts. |
| 644 | */ |
| 645 | switch (intr) { |
| 646 | case GIC_LOCAL_INT_TIMER: |
| 647 | case GIC_LOCAL_INT_PERFCTR: |
| 648 | case GIC_LOCAL_INT_FDC: |
| 649 | irq_set_chip_and_handler(virq, |
| 650 | &gic_all_vpes_local_irq_controller, |
| 651 | handle_percpu_irq); |
| 652 | break; |
| 653 | default: |
| 654 | irq_set_chip_and_handler(virq, |
| 655 | &gic_local_irq_controller, |
| 656 | handle_percpu_devid_irq); |
| 657 | irq_set_percpu_devid(virq); |
| 658 | break; |
| 659 | } |
| 660 | |
| 661 | spin_lock_irqsave(&gic_lock, flags); |
| 662 | for (i = 0; i < gic_vpes; i++) { |
| 663 | u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin; |
| 664 | |
| 665 | gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i); |
| 666 | |
| 667 | switch (intr) { |
| 668 | case GIC_LOCAL_INT_WD: |
| 669 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val); |
| 670 | break; |
| 671 | case GIC_LOCAL_INT_COMPARE: |
| 672 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val); |
| 673 | break; |
| 674 | case GIC_LOCAL_INT_TIMER: |
| 675 | /* CONFIG_MIPS_CMP workaround (see __gic_init) */ |
| 676 | val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin; |
| 677 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val); |
| 678 | break; |
| 679 | case GIC_LOCAL_INT_PERFCTR: |
| 680 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val); |
| 681 | break; |
| 682 | case GIC_LOCAL_INT_SWINT0: |
| 683 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val); |
| 684 | break; |
| 685 | case GIC_LOCAL_INT_SWINT1: |
| 686 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val); |
| 687 | break; |
| 688 | case GIC_LOCAL_INT_FDC: |
| 689 | gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val); |
| 690 | break; |
| 691 | default: |
| 692 | pr_err("Invalid local IRQ %d\n", intr); |
| 693 | ret = -EINVAL; |
| 694 | break; |
| 695 | } |
| 696 | } |
| 697 | spin_unlock_irqrestore(&gic_lock, flags); |
| 698 | |
| 699 | return ret; |
| 700 | } |
| 701 | |
| 702 | static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, |
| 703 | irq_hw_number_t hw) |
| 704 | { |
| 705 | int intr = GIC_HWIRQ_TO_SHARED(hw); |
| 706 | unsigned long flags; |
| 707 | |
| 708 | irq_set_chip_and_handler(virq, &gic_level_irq_controller, |
| 709 | handle_level_irq); |
| 710 | |
| 711 | spin_lock_irqsave(&gic_lock, flags); |
| 712 | gic_map_to_pin(intr, gic_cpu_pin); |
| 713 | /* Map to VPE 0 by default */ |
| 714 | gic_map_to_vpe(intr, 0); |
| 715 | set_bit(intr, pcpu_masks[0].pcpu_mask); |
| 716 | spin_unlock_irqrestore(&gic_lock, flags); |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, |
| 722 | irq_hw_number_t hw) |
| 723 | { |
| 724 | if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS) |
| 725 | return gic_local_irq_domain_map(d, virq, hw); |
| 726 | return gic_shared_irq_domain_map(d, virq, hw); |
| 727 | } |
| 728 | |
| 729 | static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, |
| 730 | const u32 *intspec, unsigned int intsize, |
| 731 | irq_hw_number_t *out_hwirq, |
| 732 | unsigned int *out_type) |
| 733 | { |
| 734 | if (intsize != 3) |
| 735 | return -EINVAL; |
| 736 | |
| 737 | if (intspec[0] == GIC_SHARED) |
| 738 | *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]); |
| 739 | else if (intspec[0] == GIC_LOCAL) |
| 740 | *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]); |
| 741 | else |
| 742 | return -EINVAL; |
| 743 | *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; |
| 744 | |
| 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | static const struct irq_domain_ops gic_irq_domain_ops = { |
| 749 | .map = gic_irq_domain_map, |
| 750 | .xlate = gic_irq_domain_xlate, |
| 751 | }; |
| 752 | |
| 753 | static void __init __gic_init(unsigned long gic_base_addr, |
| 754 | unsigned long gic_addrspace_size, |
| 755 | unsigned int cpu_vec, unsigned int irqbase, |
| 756 | struct device_node *node) |
| 757 | { |
| 758 | unsigned int gicconfig; |
| 759 | |
| 760 | gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size); |
| 761 | |
| 762 | gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG)); |
| 763 | gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >> |
| 764 | GIC_SH_CONFIG_NUMINTRS_SHF; |
| 765 | gic_shared_intrs = ((gic_shared_intrs + 1) * 8); |
| 766 | |
| 767 | gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >> |
| 768 | GIC_SH_CONFIG_NUMVPES_SHF; |
| 769 | gic_vpes = gic_vpes + 1; |
| 770 | |
| 771 | if (cpu_has_veic) { |
| 772 | /* Always use vector 1 in EIC mode */ |
| 773 | gic_cpu_pin = 0; |
| 774 | timer_cpu_pin = gic_cpu_pin; |
| 775 | set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET, |
| 776 | __gic_irq_dispatch); |
| 777 | } else { |
| 778 | gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET; |
| 779 | irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec, |
| 780 | gic_irq_dispatch); |
| 781 | /* |
| 782 | * With the CMP implementation of SMP (deprecated), other CPUs |
| 783 | * are started by the bootloader and put into a timer based |
| 784 | * waiting poll loop. We must not re-route those CPU's local |
| 785 | * timer interrupts as the wait instruction will never finish, |
| 786 | * so just handle whatever CPU interrupt it is routed to by |
| 787 | * default. |
| 788 | * |
| 789 | * This workaround should be removed when CMP support is |
| 790 | * dropped. |
| 791 | */ |
| 792 | if (IS_ENABLED(CONFIG_MIPS_CMP) && |
| 793 | gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) { |
| 794 | timer_cpu_pin = gic_read(GIC_REG(VPE_LOCAL, |
| 795 | GIC_VPE_TIMER_MAP)) & |
| 796 | GIC_MAP_MSK; |
| 797 | irq_set_chained_handler(MIPS_CPU_IRQ_BASE + |
| 798 | GIC_CPU_PIN_OFFSET + |
| 799 | timer_cpu_pin, |
| 800 | gic_irq_dispatch); |
| 801 | } else { |
| 802 | timer_cpu_pin = gic_cpu_pin; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS + |
| 807 | gic_shared_intrs, irqbase, |
| 808 | &gic_irq_domain_ops, NULL); |
| 809 | if (!gic_irq_domain) |
| 810 | panic("Failed to add GIC IRQ domain"); |
| 811 | |
| 812 | gic_basic_init(); |
| 813 | |
| 814 | gic_ipi_init(); |
| 815 | } |
| 816 | |
| 817 | void __init gic_init(unsigned long gic_base_addr, |
| 818 | unsigned long gic_addrspace_size, |
| 819 | unsigned int cpu_vec, unsigned int irqbase) |
| 820 | { |
| 821 | __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL); |
| 822 | } |
| 823 | |
| 824 | static int __init gic_of_init(struct device_node *node, |
| 825 | struct device_node *parent) |
| 826 | { |
| 827 | struct resource res; |
| 828 | unsigned int cpu_vec, i = 0, reserved = 0; |
| 829 | phys_addr_t gic_base; |
| 830 | size_t gic_len; |
| 831 | |
| 832 | /* Find the first available CPU vector. */ |
| 833 | while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors", |
| 834 | i++, &cpu_vec)) |
| 835 | reserved |= BIT(cpu_vec); |
| 836 | for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) { |
| 837 | if (!(reserved & BIT(cpu_vec))) |
| 838 | break; |
| 839 | } |
| 840 | if (cpu_vec == 8) { |
| 841 | pr_err("No CPU vectors available for GIC\n"); |
| 842 | return -ENODEV; |
| 843 | } |
| 844 | |
| 845 | if (of_address_to_resource(node, 0, &res)) { |
| 846 | /* |
| 847 | * Probe the CM for the GIC base address if not specified |
| 848 | * in the device-tree. |
| 849 | */ |
| 850 | if (mips_cm_present()) { |
| 851 | gic_base = read_gcr_gic_base() & |
| 852 | ~CM_GCR_GIC_BASE_GICEN_MSK; |
| 853 | gic_len = 0x20000; |
| 854 | } else { |
| 855 | pr_err("Failed to get GIC memory range\n"); |
| 856 | return -ENODEV; |
| 857 | } |
| 858 | } else { |
| 859 | gic_base = res.start; |
| 860 | gic_len = resource_size(&res); |
| 861 | } |
| 862 | |
| 863 | if (mips_cm_present()) |
| 864 | write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN_MSK); |
| 865 | gic_present = true; |
| 866 | |
| 867 | __gic_init(gic_base, gic_len, cpu_vec, 0, node); |
| 868 | |
| 869 | return 0; |
| 870 | } |
| 871 | IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init); |